This snippet of IOS code used to work prior to IOS 7 to push a new window. It does not anymore
ViewController *secondView = [[ViewController alloc]
initWithNibName:#"ViewController"bundle:nil];
[[self navigationController] pushViewController:secondView animated:YES];
Why doesn't this work anymore?
-------EDIT-----
This is the nav controller in didFinishLaunchingwWthOption
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.launchViewController = [[LaunchViewController alloc]
initWithNibName:#"LaunchViewController" bundle:nil];
self.window.rootViewController = self.LaunchViewController;
[self.window makeKeyAndVisible];
return YES;
-------EDIT----------
The first time I invoke [self addNewView] the view does not appear, with no errors in the console or crashes, I added a button and if on the button press I invoke [self addNewView] the view appears, if I navigate with the back button, I have to tap back twice to return to the initial view. So the view is being created but not shown. Any hints on what could be the problem?
Have you tried to specify tha bundle?
ViewController *secondView = [[ViewController alloc]
initWithNibName:#"ViewController" bundle: [NSBundle mainBundle]];
check this:
UINavigationController *navi = [[UINavigationController alloc]initWithRootViewController:self.launchViewController];
self.window.rootViewController = navi;
There is mo navigationController.window.rootViewController should be a navigationController as your logic.
Related
I'm using parse and I'm trying to get the login screen to show if the user isn't the "current" user. I'm having issues with my NavigationController (from my storyboard) and using it as the rootViewController even though it's already set as initial View Controller in my storyboard. Using this line of code I select the NavigationController (from my storyboard) and initialize it in my app delegate.
UINavigationController *navVC = (UINavigationController *)self.window.rootViewController;
I then decide whether or not to display the loginVC then finally I set the NavigationController as the rootViewController here:
self.window.rootViewController = navVC; [self.window makeKeyAndVisible];
Except someone I don't. I get this error when I try to build my app. "Application windows are expected to have a root view controller at the end of application launch" Anyone have any ideas what's going wrong?
Here's the code all together.
AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor whiteColor];
UINavigationController *navVC = (UINavigationController *)self.window.rootViewController;
// Initialize Parse.
[User registerSubclass];
[Question registerSubclass];
[Parse setApplicationId:#"HI"
clientKey:#"HI"];
// Determine whether or not to show the login screen
if (![PFUser currentUser]) {
LogInViewController *loginVC = [[LogInViewController alloc] init];
[navVC setViewControllers:#[loginVC] animated:YES];
} else {
QuestionsTableViewController *questionsVC = [[QuestionsTableViewController alloc] init];
[navVC setViewControllers:#[questionsVC] animated:YES];
}
self.window.rootViewController = navVC; [self.window makeKeyAndVisible];
return YES;
}
If you're starting with a storyboard you need to have it set as your Main Interface in the Deployment Info in your app's General settings. You should also remove the line:
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
..as it's initialising a new window in the place of the one created from the previous step.
I used these two lines of code to fix the issue. I got answer from here:
Programmatically set the initial view controller using Storyboards
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
UINavigationController *navVC = [storyboard instantiateViewControllerWithIdentifier:#"QuestionsView"];
I removed this line:
UINavigationController *navVC = (UINavigationController *)self.window.rootViewController;
There don't get the error anymore.
This is how I launched by main controller in my iOS app.
UIViewController *rootController = [[RootViewController alloc] init];
navigationController = [[UINavigationController alloc] initWithRootViewController:rootController];
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
[self.window setRootViewController:navigationController];
[self.window makeKeyAndVisible];
return YES;
With this I am getting a blank bar at the top.
I want to use a navigation controller to control the flow of screens that users are able to reach by pressing back but I don't want a navigation bar. How can I change my code to get what I want?
You can use this code right after you declare navigationController = ... in the code sample you provided:
[navigationController setNavigationBarHidden:true];
And then whenever you need to go "back," your app would run this code from within the current view controller:
[self.navigationController popViewControllerAnimated:true];
I searched the whole Internet for my question but obviously was to dumb to find anything.
In my app I'm working with a Storyboard and most of my ViewController are loaded in this style (I'm working with a navigation controller):
MyViewControllerClass *viewController = [storyboard instantiateViewControllerWithIdentifier:#"myViewController"];
[self.navigationController pushViewController:viewController animated:YES];
And now my question: Is it possible to push a VC in code without using storyboard for it? Like in the g'old times, but this does not work for me anymore:
MyViewControllerClass *viewController = [[MyViewControllerClass alloc] init];
[self.navigationController pushViewController:viewController animated:YES];
Please help me, I'm going crazy.
Thanks in advance.
Yes you can do it without using storyboard just you need to add navigation controller in app delegate like this, after that it will work fine
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.viewController = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
navigationController = [[UINavigationController alloc] initWithRootViewController:self.viewController];
self.window.rootViewController=navigationController;
[self.window makeKeyAndVisible];
return YES;
}
You can create xib file and push it. You can't push without visual.
ViewControllernew* vv = (ViewControllernew*)[[[NSBundle mainBundle] loadNibNamed:#"ViewControllernew" owner:self options:nil] objectAtIndex:0];
[self.navigationController pushViewController:vv animated:YES];
Can confirm it do work.
Push will act this way if viewController is nil. Does your alloc init creates actually an instance?
I try to push a UIViewController onto a UINavigationController. The NavigationBar changes (i.e. a back-button appears) but the view is not pushed (*).
I have a UITabBarController as my applications RootViewController.
When I switch to another tab and then switches back, the view (*) gets pushed.
I have never seen this behaviour before. My problem is exactly the same as this, however the methods that solved that issue did not solve mine.
Initially
After I press the row
I understand that this question might be related to issues in AppDelegate, therefore i post the code I use.
Code:
in AppDelegate:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.window.backgroundColor = [UIColor whiteColor];
[MagicalRecord setupCoreDataStackWithStoreNamed:#"DBModel"];
/* CONTACTS LIST CONTROLLER */
BoonContactListViewController *contactListViewController = [[BoonContactListViewController alloc] initWithNibName:nil bundle:nil];
UINavigationController *contactListNavigationController = [[UINavigationController alloc] initWithRootViewController:contactListViewController];
[contactListNavigationController setValue:[[BoonNavigationBar alloc]init] forKeyPath:#"navigationBar"];
contactListNavigationController.tabBarItem.title = [NSLocalizedString(#"CONTACTS", nil) capitalizedString];
contactListNavigationController.tabBarItem.image = [UIImage imageNamed:#"menu_contacts.png"];
/* INVITATIONS */
BoonInvitationListViewController *invitationListController = [[BoonInvitationListViewController alloc] initWithNibName:nil bundle:nil];
UINavigationController *invitationNavigationController = [[UINavigationController alloc] initWithRootViewController:invitationListController];
[invitationNavigationController setValue:[[BoonNavigationBar alloc]init] forKeyPath:#"navigationBar"];
invitationNavigationController.tabBarItem.title = [NSLocalizedString(#"SETTINGS", nil) capitalizedString];
invitationNavigationController.tabBarItem.image = [UIImage imageNamed:#"menu_invitations.png"];
/* SETTINGS */
BoonSettingsViewController *settingsViewController = [[BoonSettingsViewController alloc] initWithNibName:nil bundle:nil];
UINavigationController *settingsNavigationController = [[UINavigationController alloc] initWithRootViewController:settingsViewController];
[settingsNavigationController setValue:[[BoonNavigationBar alloc]init] forKeyPath:#"navigationBar"];
settingsNavigationController.tabBarItem.title = [NSLocalizedString(#"SETTINGS", nil) capitalizedString];
settingsNavigationController.tabBarItem.image = [UIImage imageNamed:#"menu_settings.png"];
/* TAB BAR */
BoonTabBarViewController *tabBarController = [[BoonTabBarViewController alloc] init];
tabBarController.viewControllers = #[contactListNavigationController, invitationNavigationController, settingsNavigationController];
[self.window setRootViewController:tabBarController];
[self.window makeKeyAndVisible];
[tabBarController showLogin];
return YES;
}
EDIT:
In the viewController that i am trying to push, neither viewWillAppear, viewDidLoad nor viewDidAppear is called.
If I use presentViewController: animated: completion: I get the preferred behaviour, id rather not though
EDIT 2
How I push my new VC
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
BoonContactInfoViewController *contactInfoViewController = [[BoonContactInfoViewController alloc] initWithNibName:nil bundle:nil];
NSLog(#"NAV %#", self.navigationController);
[self.navigationController pushViewController:contactInfoViewController animated:YES];
}
EDIT 3
It is only the initial tab that cannot push ... if i swap places of the first and second tab, i can push a view controller using in the way i do above.
EDIT 4
It works if i (in my tabBarController) calls
self.selectedIndex = 1;
self.selectedIndex = 0;
EDIT 5
- (void)showLogin
{
if([BoonUserHandler getLogin].length > 0 && [BoonUserHandler getPassword].length > 0){
return;
}
BoonWelcomeViewController *welcomeWC = [[BoonWelcomeViewController alloc] initWithNibName:nil bundle:nil];
UINavigationController *welcomeNavigationController = [[UINavigationController alloc] initWithRootViewController:welcomeWC];
[welcomeNavigationController setNavigationBarHidden:YES];
[self presentViewController:welcomeNavigationController animated:NO completion:nil];
}
What version of iOS are you developing for?
I'd first ask why you're hacking in a nav bar using:
[settingsNavigationController setValue:[[BoonNavigationBar alloc]init] forKeyPath:#"navigationBar"];
rather than the iOS5+ UINavigationController method:
- (instancetype)initWithNavigationBarClass:(Class)navigationBarClass toolbarClass:(Class)toolbarClass
But my overall suggestion would be to remove all this code and use a storyboard. This looks like the perfect opportunity.
I think you are getting wrong Navigation controller to push that's why it showing this problem..
You have to fetch right navigation controller from tab controller
self.tabBarController.selectedIndex = 0;
just change tab controller selected index
I have a tab bar application in Xcode 4.3 and I'm trying to insert a login screen before the tabbar is shown. The app works OK if presentModalViewController has animated:YESbut if it is without animation the view is not showing.
#synthesize window = _window;
#synthesize tabBarController = _tabBarController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
UIViewController *viewController1 = [[FirstViewController alloc] initWithNibName:#"FirstViewController" bundle:nil];
UIViewController *viewController2 = [[SecondViewController alloc] initWithNibName:#"SecondViewController" bundle:nil];
self.tabBarController = [[UITabBarController alloc] init];
self.tabBarController.viewControllers = [NSArray arrayWithObjects:viewController1, viewController2, nil];
self.window.rootViewController = self.tabBarController;
LogInViewController *logViewController = [[LogInViewController alloc] initWithNibName:#"LogInViewController" bundle:nil];
[self.window addSubview:_tabBarController.view];
[self.tabBarController presentModalViewController:logViewController animated:YES];
//This wont work
//[self.tabBarController presentModalViewController:logViewController animated:NO];
[self.window makeKeyAndVisible];
return YES;
}
-(void)loginDone{
NSLog(#"back to the app delegate");
[self.tabBarController dismissModalViewControllerAnimated:YES];
}
Is this the right way to do it?
Why wont the code work with animated:NO ?
I also get this on output Unbalanced calls to begin/end appearance transitions for <UITabBarController: 0x689d350>.
First of all, move [self.window makeKeyAndVisible]; before your view controller setup.
Additionally, you should be presenting the modal view controller within the viewWillAppear: method of the view controller that will be visible first, to make sure your apps view hierarchy has been fully initialized before presenting your login screen.
Don't do this:
[self.window addSubview:_tabBarController.view];
Do this:
self.window.rootViewController = _tabBarController;
This will put the tabBarController on the screen. But that's not exactly what you want... My advise is:
1) Start by putting the logViewController has the rootViewController as I showed you above.
2) Once you got what you want (login is successful) just tell the AppDelegate to switch the rootViewController. This can be done in with delegation or notifications.
Also, as Toastor indirectly pointed out, you should start the presentViewController from the UIViewController who actually initiates it (and not from the AppDelegate).